function na_preload_img()
{ 
  var img_list = na_preload_img.arguments;
  if (document.preloadlist == null) 
    document.preloadlist = new Array();
  var top = document.preloadlist.length;
  for (var i=0; i < img_list.length-1; i++) {
    document.preloadlist[top+i] = new Image;
    document.preloadlist[top+i].src = img_list[i+1];
  } 
}

function na_change_img_src(name, nsdoc, rpath, preload)
{ 
  var img = eval((navigator.appName.indexOf('Netscape', 0) != -1) ? nsdoc+'.'+name : 'document.all.'+name);
  if (name == '')
    return;
  if (img) {
    img.altsrc = img.src;
    img.src    = rpath;
  } 
}

function na_restore_img_src(name, nsdoc)
{
  var img = eval((navigator.appName.indexOf('Netscape', 0) != -1) ? nsdoc+'.'+name : 'document.all.'+name);
  if (name == '')
    return;
  if (img && img.altsrc) {
    img.src    = img.altsrc;
    img.altsrc = null;
  } 
}

// vyskakovací banner na hlavní stránce
function xmass_banner()
{
	var url = document.location.href;
	if(url.match(/^http:\/\/(www|it|ru|de|en)?\.?(ufleku\.cz)\/?$/gi))
	{
		var img = new Image(400,400);
		img.id  = 'xmass_banner';
		img.src = 'http://ufleku.cz/art/vanoce.png';		
		var box = document.getElementById('hlava01');
		box.setAttribute('style', 'position:relative;');
		box.appendChild(img);
		var pop = document.getElementById('xmass_banner');
		pop.setAttribute('style', 'position:absolute;top:100px;left:350px;border:3px solid #999;cursor:pointer;');
		pop.setAttribute('alt', 'Kliknutím zavřít');
		add_event(pop, 'click', rem_xmass_banner);
	}
}
function rem_xmass_banner()
{
	var box = document.getElementById('hlava01');
	var pop = document.getElementById('xmass_banner');
	box.removeChild(pop);
}

function add_event( obj, type, fn ) {
  if ( obj.attachEvent ) {
    obj['e'+type+fn] = fn;
    obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
    obj.attachEvent( 'on'+type, obj[type+fn] );
  } else
    obj.addEventListener( type, fn, false );
}
//window.onload = xmass_banner;